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  <title>sorting</title>

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  <h1>sorting</h1>

<div id="options">
  <h2>Sort</h2>
  <ul class="option-set">
    <li><a href="#original-order">original-order</a></li>
    <li><a href="#number">number</a></li>
    <li><a href="#name">name</a></li>
    <li><a href="#symbol">symbol</a></li>
    <li><a href="#weight">weight</a></li>
    <li><a href="#category">category</a></li>
  </ul>
</div>

<div id="container">
  
  <div class="element transition metal   " data-symbol="Hg" data-category="transition">
    <p class="number">80</p>
    <h3 class="symbol">Hg</h3>
    <h2 class="name">Mercury</h2>
    <p class="weight">200.59</p>
  </div>

  <div class="element metalloid   " data-symbol="Te" data-category="metalloid">
    <p class="number">52</p>
    <h3 class="symbol">Te</h3>
    <h2 class="name">Tellurium</h2>
    <p class="weight">127.6</p>
  </div>

  <div class="element post-transition metal   " data-symbol="Bi" data-category="post-transition">
    <p class="number">83</p>
    <h3 class="symbol">Bi</h3>
    <h2 class="name">Bismuth</h2>
    <p class="weight">208.9804</p>
  </div>

  <div class="element transition metal   " data-symbol="Cd" data-category="transition">
    <p class="number">48</p>
    <h3 class="symbol">Cd</h3>
    <h2 class="name">Cadmium</h2>
    <p class="weight">112.411</p>
  </div>

  <div class="element alkaline-earth metal   " data-symbol="Ca" data-category="alkaline-earth">
    <p class="number">20</p>
    <h3 class="symbol">Ca</h3>
    <h2 class="name">Calcium</h2>
    <p class="weight">40.078</p>
  </div>

  <div class="element transition metal   " data-symbol="Re" data-category="transition">
    <p class="number">75</p>
    <h3 class="symbol">Re</h3>
    <h2 class="name">Rhenium</h2>
    <p class="weight">186.207</p>
  </div>

  <div class="element post-transition metal   " data-symbol="Tl" data-category="post-transition">
    <p class="number">81</p>
    <h3 class="symbol">Tl</h3>
    <h2 class="name">Thallium</h2>
    <p class="weight">204.3833</p>
  </div>

  <div class="element metalloid   " data-symbol="Sb" data-category="metalloid">
    <p class="number">51</p>
    <h3 class="symbol">Sb</h3>
    <h2 class="name">Antimony</h2>
    <p class="weight">121.76</p>
  </div>

  <div class="element transition metal   " data-symbol="Co" data-category="transition">
    <p class="number">27</p>
    <h3 class="symbol">Co</h3>
    <h2 class="name">Cobalt</h2>
    <p class="weight">58.933195</p>
  </div>

  <div class="element lanthanoid metal inner-transition   " data-symbol="Lu" data-category="lanthanoid">
    <p class="number">71</p>
    <h3 class="symbol">Lu</h3>
    <h2 class="name">Lutetium</h2>
    <p class="weight">174.9668</p>
  </div>

  <div class="element noble-gas nonmetal   " data-symbol="Ar" data-category="noble-gas">
    <p class="number">18</p>
    <h3 class="symbol">Ar</h3>
    <h2 class="name">Argon</h2>
    <p class="weight">39.948</p>
  </div>

  <div class="element alkali metal   " data-symbol="Rb" data-category="alkali">
    <p class="number">37</p>
    <h3 class="symbol">Rb</h3>
    <h2 class="name">Rubidium</h2>
    <p class="weight">85.4678</p>
  </div>

  <div class="element other nonmetal   " data-symbol="N" data-category="other">
    <p class="number">7</p>
    <h3 class="symbol">N</h3>
    <h2 class="name">Nitrogen</h2>
    <p class="weight">14.0067</p>
  </div>

  <div class="element actinoid metal inner-transition   " data-symbol="Np" data-category="actinoid">
    <p class="number">93</p>
    <h3 class="symbol">Np</h3>
    <h2 class="name">Neptunium</h2>
    <p class="weight">(237)</p>
  </div>

  <div class="element actinoid metal inner-transition   " data-symbol="Ac" data-category="actinoid">
    <p class="number">89</p>
    <h3 class="symbol">Ac</h3>
    <h2 class="name">Actinium</h2>
    <p class="weight">(227)</p>
  </div>
</div>

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var container = document.querySelector('#container');
var iso = window.iso = new Isotope( container, {
  layoutMode: 'fitRows',
  getSortData: {
    // number: function( itemElem ) {
    //   return parseInt( getText( itemElem.querySelector('.number') ), 10 );
    // },
    // symbol: function( itemElem ) {
    //   return getText( itemElem.querySelector('.symbol') );
    // },
    // name: function( itemElem ) {
    //   return getText( itemElem.querySelector('.name') );
    // },
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    //   return itemElem.getAttribute('data-category');
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      return parseFloat( weight.replace( /[\(\)]/g, '') );
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